Thanks Alvaro!
The thought of psql_help purely because it was the easiest at that time. Since I've just begun my understanding of the code is barely negligible.
I began working on SEQUENCE related tests thereafter and hopefully would move to more complicated tests in time. Peter's link is obviously helpful but since I end up doing make check ~100 of times a day, for now its useful only to cross-check how much code is uncommitted :)